Dual brake control



April 19, 1949. YEATMAN 2,467,645

DUAL BRAKE CONTROL Filed May 24, 1948 IN VE N TOR R OBER T ERNES 7 YEA'TMA N ATTORNEY Patented Apr. 19 1949 DUAL BRAKE CONTROL Robert Ernest Yeatman, Campbell River, British Columbia, Canada Application May 24, 1948, Serial No. 28,852

3 Claims.

My invention relates to improvements in dual brake controls, which are particularly adapted for use with yarding donkeys or other winches having a pair of separately driven drums each provided with brakes to retard their rotation.

The objects of the invention are to save time and effort in applying the brakes; to provide a control which operates on one or both of the brake drums to which it is fitted; to provide a control operated conveniently by the left hand of the operator, so that his right hand can be entirely used for operating the main friction lever of the engine and which enables the operator to conveniently watch all hand signals and to control his machine to the general safety of his crewmen.

Referring to the drawings:

Fig. 1 is a front elevational view of the device as applied to the operators side of a yarding donkey.

Fig. 2 is a sectional view taken on the line 2-2 of Figure 1.

Fig. 3 is a diagrammatic view showing the position of the control line when the brake control is entirely released, when one or more of the brakes is being locked in engaging position, and when both brakes are locked in a set position.

In the drawings like characters of reference indicate corresponding parts in each figure.

The numeral I indicates generally the frame of a yarding donkey which supports a plurality of independently driven winding drums (not shown) The numeral 2 indicates a longitudinal member of the frame I, and disposed above said frame member is a horizontal member 4 common to some donkey engines and used generally to house a transmission rock shaft or other operational part of the donkey engine.

Pivotally mounted from the frame member 2 are substantially horizontal levers 5 and 6, which are operatively connected to brakes applied to the main line drum and the haulback drum respectively (not shown) of the engine. Each of the levers 5 and 6, is provided with a foot pedal 8 and has an inturned lip I on one upper side edge for the purpose of engaging a rack l2, which rack is rockingly supported in a bearing It mounted at the base of the frame 2.

The racks I2 are formed on one edge of the vertical leg I of a bell crank It. The bell cranks i6 are spaced part adjacent the free ends of the levers 5 and 6 so that each rack can be engaged by the inturned lip II] of the said levers. A spring I! is attached to the rear horizontal leg I8 of each of the bell cranks IE to normally hold the racks in the vertical position as shown in Fig. 2.

A swivel joint 20 consisting preferably of two clevises 2I pivotallyv connected together, is attached to the free end of the horizontal leg I8 of each of the bell cranks I6 and the upper part of the joints 20 is pivotally connected to a cross bar 23. From the centre of the cross bar 23 a flexible member or control line 25 is extended upwardly and is fastened to the horizontal member 4 of the donkey, or to any other suitable part at an appropriate height to enable it to be conveniently gripped by the operators left hand. The preferred form of the flexible member is two short lengths of cable 26 joined together by a turnbuckle 2l. The flexible member 25 is adjusted to length so as to leave it normally straight with a slight tension on the cross bar 23 and on both bell cranks I6 as at A in Figure 3. In this position the racks I2 are substantially vertical and both brake levers 5 and 6 are out of engagement therewith.

If it is necessary to apply brake to the main line drum with the lever 5 and hold said lever in braking position, said lever is depressed and the control line 25 pulled outwardly as indicated in diagram B of Figure 3, thus causing the bell cranks I6 to swing together and the adjacent rack I2 to strike the lever 5. On releasing the foot strain on lever 5, its adjacent rack l2 will latch onto said lever holding it in its then position. The control line 25 may then be released if desired and the lever 5 will still remain held as at C in Figure 3. Should braking action be required with the lever B, said lever may be depressed while tensioning the control line, the lever will slide its lip ID down the adjacent rack l2 in contact with its teeth and wherever said lever stops engagement will take place to hold the lever. When one or both levers are engaged by their racks, the control line 25 may be released entirely and no releasing of the lips Iil of the levers can take place until one or both of the levers are depressed slightly beyond its held position to enable the spring ll of the adjacent rack I2 to return the bell crank I6 to its original vertical position.

What I claim as my invention is:

1. Brake control device adapted to engage a pair of foot brake levers of a winding engine comprising a pair of bell cranks pivotally mounted in spaced relation adjacent said foot levers, each of said bell cranks having a rack adapted to engage a lever and hold said lever against return movement, and a horizontal leg, the horizontal legs of the bell cranks being connected to- 3 gether by a compensating member, means for lifting the compensating member to tilt either or both of said racks into engagement with said levers, and means for returning the bell cranks to normal position.

2. Brake control device adapted to engage a pair of foot brake levers of a winding engine comprising a pair of bell cranks pivotally mounted in spaced relation adjacent said foot levers, each of said bell cranks having a rack adapted to engage a lever and hold said lever against return movement, and a horizontal leg, the horizontal legs of the bell cranks being fitted with universal joints and connected together with a bar, means engaging the bar intermediate its length for raising said bar to tilt either or both of said racks into engagement with said levers, and means for returning the bell cranks to normal position.

3. Brake control device adapted to engage a pair of foot brake levers of a winding engine comprising a pair of bell cranks pivotally mounted in spaced relation adjacent said foot levers, each of said bell cranks having a rack adapted to engage a lever and hold said lever against return movement, and a horizontal leg, the horizontal legs of the bell cranks being connected together by a compensating member, a flexible member connected to said compensating member intermediate its length, said flexible member being adapted for anchorage to a fixed part of the winding engine, and means for returning the bell cranks to normal position.

ROBERT ERNEST YEATMAN.

No references cited. 

